Furnace-grate.



H. O. DORSEYI FURNACE GRATE.

APPLICATION mm nov. 14. m1.

Patented July 30, 1918.

w A W K fl M w k W v guoentoz Gumm HARRY O. DORSEY, OF ATLANTA, GEORGIA.

FUBNACE-GRATE.

Specification of Letters Patent.

Patented July 30, 1918 Application filed November 14, 1917. Serial No, 201,965.

To all whom it may concern:

Be it known that I, HARRY O. DORSEY, a citizen of the United States of America, and a resident of Atlanta, county of Fulton, and State of Georgia, have invented certain new and useful Improvements in Furnace- Grates, of which the following is a full and clear specification.

This invention relates to that type of forced draft furnace grates in which the fuel-supporting surface is constructed of a series of closely spaced hollow sections in the top wall of each of which is formed a series of circular nozzles formed by circular holes in the top wall in each of which is fitted a circular beveled cover or disk, the beveled edge of the disk being held away from the correspondingly beveled edge of the opening to form a circular air-supplying slit; and one of the objects of the resent inventionis to improve and simpli y the manner of fastenlng the nozzle plates in position in the grate bar, whereby they may be more.

readily removed from time to time for cleaning or repairing, as more fully hereinafter set forth;

Another object is to provide simple means i against dislodgment of these plates during the act of cleaning off the grate surface;

and a still further object is to provide simple means whereby the ashes which .sift down through the air openings onto the bottom of the hollow sections may be readily removed therefrom and deposited underneath the grate, as more fully hereinafter set forth.

In the drawing cordance with my invention; and

Fig. 2 is a vertical sectional view on the line 22 of Fig. 1

Referring to the drawing annexed by reference characters, a designates the hollow grate bar or section which is approximately rectangular in cross-section and is provided with'a flat top surface. At intervals along the bar, circular openings are formed in the top wallof the bar, the wall of each opening being beveled downwardly. In each of these openings is fitted a nozzle disk I) bev-- eled at its edge tocorrespond with the bevel of the opening, the beveled edge of the disk being provided with several vertical ribs 0 to space the disk a short distance away from the beveled wall of the opening, to thereby provide the usual annular air passa e.

Irojecting inwardly from each side-wall of the channel bar, adjacent to each opening, is alug d, and formed on each disk I) are two pairs of depending lugs e", so positioned on the disk as to embrace or straddle. the lugs cl whenthe disk is in place. These depending lugs or fingers e loosely embrace lugs d, so' that the disk may be quickly and readily detached from the bar by simply lifting it out of the opening. The interlocking lugs tend to prevent the disk from being tilted and dislodged while in use. The

former way of securing these disks was to lock them injplace by a bar and bolts, so that when the diskshad to be repaired or renewed it was necessary to draw the fire and allow the furnace to .cool down and then remove the nuts and bolts and bar,

fective disks and replacelthem by new ones,

the new disks 'being simply dropped into place with their fingers 'e in engagement with the inwardly-extending lugs d. It will be observed, therefore, that my device makes Figure 1 is a side elevation, partly broken away, of a grate section constructed in acit possible to avoid a great deal of delay in making repairs to the nozzles.

It willbe observed that by employing a series of lugsfalong the inner facesof the walls of the bar as a means forlockin the nozzle plates, there will be no danger o disturbing the relative location of the lugs with reference to the openings by the warping"or twisting of the bar under the heat of the furnace. y e

To still further lock the nozzle plates against accidental removal by the cleaning,

scraping or stirring tool, I pivotally depend from each disk a pair of hooks g which normally swing under the lugs (Z and thus latch the air disk in place. By swinging these hooks inwardly toward each other, the disk may be readily withdrawn-and replaced by another. The lower ends of the hooks are beveled, so as to automatically latch under the lugs when the disk is dropped into Pl The bottom wall it of the hollow section inclines downwardly and forwardly from the air-inlet z to the forward end of the section, and this forward end of the section is provided with an opening which is normally closed by a door j pivoted at its lower end to the bottom wall and adapted to swing downwardly, as shown in dotted lines. The door is operated by means of a bell crank'la, one arm of which is pivoted at Z tothe door and the other arm of which is pivotally connected to an operating rod m and to hold the door normally closed I append to the bell-crank a weight a. By opening the door y from time to time,the blast of air usually supplied through the inlet i will,

instead of passing up through the air openings in the surface of the grate, pass out through the uncovered opening in the outer end of the bar and thus blow out the ashes dust-that accumulates within the hollow section, thereby providing a simple means for preventing the dust accumulating in the sections sufficiently to cause injury to the top wall 0f the air nozzles by burning. The door at the front of the section also permits ready inspection from time to time of the interior of the section, and it will be observed, of course, that if the blast of air does not entirely clean out the dust, the remaining dust may be readily raked out.

It will be observed that the ash-exit is in the end wall of the section, that is, at the lower corner, at the junction of the bottom wall and the end wall, so that if ashes accumulate on the bottom of the section they may be readily raked out; and it will be seen further that this arrangement of the exit opening permits ready inspection of the interior of the section throughout its full length.

It will observed that lugs cl together with the depending pairs of fingers e prevent the nozzle plate being rotated by the cleaning tools, thereby preventing accidental dislodgment of the nozzle plates, and it will be observed also that the lugs d are located on the side walls of the section at a distance below vthe nozzle opening, so as to thereby prevent any accumulation of ashes on the top sides of the lugs (Z from interfering with the placing of the nozzle plates in position. This location of the lugs d also facilitates the use of normally-operating embodiment having been specifically described, what is claimed as new is:

l.-A channel grate-bar provided with holes at intervals in its top surface and also a pair of inwardly-extending lugs at a distance below the top surface of the bar, one pair of oppositely-extending lugs being arranged under each opening, each nozzle plate being provided with two pairs of depending fingers, each pair being adapted to embrace one of said lugs and thus prevent the nozzle plates from rotating.

2. A channel grate-bar provided with holes at intervals in its top surface and also a pair of inwardly-extending lugs at a distance below the top surface of the bar, one pair of oppositely-extending lugs being arranged under each opening, each nozzle plate being provided with a pair of pivotal depending hooks normally engaging under said lugs, and also with depending fingers engaging said lugs to guide the hooks into proper engagement with said lugs, for the purpose set forth.

3. A'hollow grate bar or section provided with air-escape openings in its top surface,

an inlet at one end to admit air under pres sure, and an ash-exit at its other end, this exit being formed at the j unction of the bottom-wall and the adjacent end-wall of the section to thereby form an unobstructed opening at this end of the bar, the bottomwall being inclined from 'said air-inlet to said ash-exit to thereby permit the air supply to assist in discharging the ashes, a pivoted closure-plate for the ash-exit, devices for normally closing this plate against air-pressure in the section, and means for opening said closure-plate.

4. A hollow gratebar or section provided with air-escape openings in its top surface, an air-inlet at one end and an ash-exit at its other end, this exit being formed at the juncture of the bottom-wall and the adjacent end-wall of the'bar to thereby form an unobstructed opening at this end ofthe bar, said bottom-wall being inclined from said air-inlet to said ash-exit to thereby permit the air-pressure to be utilizedin assisting in discharging the ashes at said ashexit, a closure plate for this opening, and means for operating this closure-plate.

5. A hollow grate-bar or section provided with air-escape openings in its top surface, an air-inlet at one end, an ash-exit at its other end, this exit being formed at the juncture of the bottom-wall and the adj acent end-wall of the bar, to thereby form closure-plate, an operating rod connected to an unobstructed opening at this end of the the other arm of the angle-lever, and a bar, a pivoted closure-plate for this openweight connected to the angle-lever tending 10 ing, and means for operating this closureto normally close the closure-plate.

5 plate, said means consisting of an angle- In testimony whereof I hereunto afiix my lever pivotally mounted on the bar and havsignature. ing one end in pivotal engagement with the HARRY O. DORSEY.

Copies of this potent my be obtained for five cents each, by addressing the "Commissioner of Patenta, Washington, D. 0. 

